/**
 * $RCSfile$
 * $Revision$
 * $Date$
 *
 * Copyright 2003-2007 Jive Software.
 *
 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jivesoftware.smack.filter;

import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.util.StringUtils;

/**
 * Filter for packets where the "from" field exactly matches a specified JID. If
 * the specified address is a bare JID then the filter will match any address
 * whose bare JID matches the specified JID. But if the specified address is a
 * full JID then the filter will only match if the sender of the packet matches
 * the specified resource.
 * 
 * @author Gaston Dombiak
 */
public class FromMatchesFilter implements PacketFilter {

	private String address;
	/**
	 * Flag that indicates if the checking will be done against bare JID
	 * addresses or full JIDs.
	 */
	private boolean matchBareJID = false;

	/**
	 * Creates a "from" filter using the "from" field part. If the specified
	 * address is a bare JID then the filter will match any address whose bare
	 * JID matches the specified JID. But if the specified address is a full JID
	 * then the filter will only match if the sender of the packet matches the
	 * specified resource.
	 * 
	 * @param address
	 *            the from field value the packet must match. Could be a full or
	 *            bare JID.
	 */
	public FromMatchesFilter(String address) {
		if (address == null) {
			throw new IllegalArgumentException("Parameter cannot be null.");
		}
		this.address = address.toLowerCase();
		matchBareJID = "".equals(StringUtils.parseResource(address));
	}

	public boolean accept(Packet packet) {
		if (packet.getFrom() == null) {
			return false;
		} else if (matchBareJID) {
			// Check if the bare JID of the sender of the packet matches the
			// specified JID
			return packet.getFrom().toLowerCase().startsWith(address);
		} else {
			// Check if the full JID of the sender of the packet matches the
			// specified JID
			return address.equals(packet.getFrom().toLowerCase());
		}
	}

	public String toString() {
		return "FromMatchesFilter: " + address;
	}
}
